Field vectors at dimensionless times t ≈ 6.6,7.0,7.3 Gyr (row a)), t ≈ 7.5,7.8 Gyr (row b)), for Model 17 (with η = 2 × 1026 cm2 s-1). The vectors give the magnetic field direction, and their lengths are proportional to the magnetic field strengths. The interaction occurs during 6.6 ≤ t ≲ 7.5 Gyr.
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